li:nth-child(1){
    background-color: pink;
}
li:nth-child(2){
    background-color: blue;
}
li:nth-child(3){
    background-color: green;
}
li:nth-child(4){
    background-color: purple;
}
.box{
    width: 580px;
    height: 360px;
    background-color: pink;
    background: url(./1.jpg);
}
